Constituent member of collet, chuck, collet and fastening nut and collet chuck

Abstract

It is an object of the invention to provide a constituent member of a collet chuck, a collet and a fastening nut as well as a collet chuck capable of reinforcing a holding force of a tool. As means therefor, in a collet chuck including a chuck body having a taper hole in an inwardly converging shape, a diameter contractable collet having a first taper face fitted to the taper hole, and a fastening nut screwed to the chuck body, there is provided a force increasing collet with a first contact face and a second contact face respectively brought into contact with a second taper face formed at an outer peripheral face of a front end portion of the collet and inclined to reduce an outer diameter as proceeding to a front end thereof, and a third taper face formed at an inner peripheral face of a front end portion of the fastening nut and inclined to reduce an inner diameter as proceeding to a front end thereof, wherein in a state of fastening the fastening nut to the chuck body, a front side of the first contact face of the force increasing collet is not brought into contact with an outer peripheral face of the collet in a state of pressing the collet frontwardly.

1 . A constituent member of a collet chuck including a chuck body with a taper hole in an inwardly converging shape, a diameter contractable collet having a first taper face fitted to the taper hole, and a fastening nut screwed to the chuck body, the constituent member comprising:
 a first contact face and a second contact face respectively brought into contact with a second taper face formed at an outer peripheral face of a front end portion of the collet and inclined to reduce an outer diameter as proceeding to a front end thereof, and a third taper face formed at an inner peripheral face of a front end portion of the fastening nut and inclined to reduce an inner diameter as proceeding to a front end thereof;   wherein in a state of fastening the fastening nut to the chuck body, a front side of the first contact face is not brought into contact with an outer peripheral face of the collet in a state of pressing the collet forwardly.   
   
   
       2 . A collet of a collet chuck including a chuck body having a taper hole in an inwardly converging shape, a diameter contractable collet with a first taper face fitted to the taper hole, and a fastening nut screwed to the chuck body, the collet comprising:
 a force increasing collet with a first contact face and a second contact face respectively brought into contact with a second taper face formed at an outer peripheral face of a front end portion of the collet and inclined to reduce an outer diameter as proceeding to a front end thereof, and a third taper face formed at an inner peripheral face of a front end portion of the fastening nut and inclined to reduce an inner diameter as proceeding to a front end thereof;   wherein in a state of fastening the fastening nut to the chuck body, a front side of the first contact face of the force increasing collet is not brought into contact with an outer peripheral face of the collet in a state of pressing the collet frontwardly.   
   
   
       3 . A fastening nut of a collet chuck including a chuck body with a taper hole in an inwardly converging shape, a diameter contractable collet with a first taper face fitted to the taper hole, and a fastening nut screwed to the chuck body, the fastening nut comprising:
 a force increasing collet with a first contact face and a second contact face respectively brought into contact with a second taper face formed at an outer peripheral face of a front end portion of the collet and inclined to reduce an outer diameter as proceeding to a front end thereof, and a third taper face formed at an inner peripheral face of a front end portion of the fastening nut and inclined to reduce an inner diameter as proceeding to a front end thereof;   wherein in a state of fastening the fastening nut to the chuck body, a front side of the first contact face of the force increasing collet is not brought into contact with an outer peripheral face of the collet in a state of pressing the collet frontwardly.   
   
   
       4 . A collet chuck including a chuck body having a taper hole in an inwardly converging shape, a diameter contractable collet with a first taper face fitted to the taper hole, and a fastening nut screwed to the chuck body, the collet chuck further comprising:
 a force increasing collet with a first contact face and a second contact face respectively brought into contact with a second taper face formed at an outer peripheral face of a front end portion of the collet and inclined to reduce an outer diameter as proceeding to a front end thereof, and a third taper face formed at an inner peripheral face of a front end portion of the fastening nut and inclined to reduce an inner diameter as proceeding to a front end thereof;   wherein in a state of fastening the fastening nut to the chuck body, a front side of the first contact face of the force increasing collet is not brought into contact with an outer peripheral face of the collet in a state of pressing the collet frontwardly.   
   
   
       5 . A constituent member of a collet chuck including a chuck body having a taper hole in an inwardly converging shape, a diameter contractable collet with a first taper face fitted to the taper hole, and a fastening nut screwed to the chuck body, the constituent member comprising:
 a first contact face and a second contact face respectively brought into contact with a second taper face formed at an outer peripheral face of a front end portion of the collet and inclined to reduce an outer diameter as proceeding to a front end thereof, and a third taper face formed at an inner peripheral face of a front end portion of the fastening nut and inclined to reduce an inner diameter as proceeding to a front end thereof, and   a third contact face brought into contact with a fourth taper face formed on a front side of the second taper face of the collet and inclined to increase an outer diameter as proceeding to a front end thereof in a state of fastening the fastening nut to the chuck body;   an angle of the third contact face relative to a diameter direction of the collet chuck being larger than an angle of the first contact face relative to the diameter direction of the collet chuck.   
   
   
       6 . A collet of a collet chuck including a chuck body with a taper hole in an inwardly converging shape, a diameter contractable collet with a first taper face fitted to the taper hole, and a fastening nut screwed to the chuck body, the collet comprising:
 a force increasing collet with a first contact face and a second contact face respectively brought into contact with a second taper face formed at an outer peripheral face of a front end portion of the collet and inclined to reduce an outer diameter as proceeding to a front end thereof, and a third taper face formed at an inner peripheral face of a front end portion of the fastening nut and inclined to reduce an inner diameter as proceeding to a front end thereof;   and with a third contact face brought into contact with a fourth taper face formed on a front side of the second taper face of the collet and inclined to increase an outer diameter as proceeding to a front end thereof in a state of fastening the fastening nut to the chuck body; and   wherein an angle of the third contact face relative to a diameter direction of the collet chuck is larger than an angle of the first contact face relative to the diameter direction of the collet chuck.   
   
   
       7 . A fastening nut of a collet chuck including a chuck body with a taper hole in an inwardly converging shape, a diameter contractable collet with a first taper face fitted to the taper hole, and a fastening nut screwed to the chuck body, the fastening nut comprising:
 a force increasing collet with a first contact face and a second contact face respectively brought into contact with a second taper face formed at an outer peripheral face of a front end portion of the collet and inclined to reduce an outer diameter as proceeding to a front end thereof, and a third taper face formed at an inner peripheral face of a front end portion of the fastening nut and inclined to reduce an inner diameter as proceeding to a front end thereof;   and with a third contact face brought into contact with a fourth taper face formed on a front side of the second taper face of the collet and inclined to increase an outer diameter as proceeding to a front end thereof in a state of fastening the fastening nut to the chuck body; and   wherein an angle of the third contact face relative to a diameter direction of the collet chuck is larger than an angle of the first contact face relative to the diameter direction of the collet chuck.   
   
   
       8 . A collet chuck comprising a chuck body with a taper hole in an inwardly converging shape, a diameter contractable collet with a first taper face fitted to the taper hole, and a fastening nut screwed to the chuck body, the collet chuck comprising:
 a force increasing collet with a first contact face and a second contact face respectively brought into contact with a second taper face formed at an outer peripheral face of a front end portion of the collet and inclined to reduce an outer diameter as proceeding to a front end thereof, and a third taper face formed at an inner peripheral face of a front end portion of the fastening nut and inclined to reduce an inner diameter as proceeding to a front end thereof;   and with a third contact face brought into contact with a fourth taper face formed on a front side of the second taper face of the collet and inclined to increase an outer diameter as proceeding to a front end thereof in a state of fastening the fastening nut to the chuck body; and   wherein an angle of the third contact face relative to a diameter direction of the collet chuck is larger than an angle of the first contact face relative to the diameter direction of the collet chuck.   
   
   
       9 . The constituent member of a collet chuck according to  claim 1  or  5 , further comprising:
 that an angle of the second contact face relative to the diameter direction of the collet chuck is larger than the angle of the first contact face relative to the diameter direction of the collet chuck.   
   
   
       10 . The collet of a collet chuck according to  claim 2  or  6 , further comprising:
 that an angle of the second contact face relative to the diameter direction of the collet chuck is larger than the angle of the first contact face relative to the diameter direction of the collet chuck.   
   
   
       11 . The fastening nut of the collet chuck according to  claim 3  or  7 , further comprising:
 that an angle of the second contact face relative to the diameter direction of the collet chuck is larger than the angle of the first contact face relative to the diameter direction of the collet chuck.   
   
   
       12 . The collet chuck according to  claim 4  or  8 , further comprising:
 that an angle of the second contact face relative to the diameter direction of the collet chuck is larger than the angle of the first contact face relative to the diameter direction of the collet chuck.